Sally and marta had the same number of post cards. after sally sold 18 of her postcards, martam had 4 time as many post cards as sally how many postcards did each girl have to begin with ?

What are “like terms”? why can we only add like terms?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).